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Old 07-11-2006, 01:06 AM   #1
xFactor
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Default ST modified injector scaling issues

I'm still chasing rich fueling problems with modified injectors and ST. Most of the time I'm scaled at 4114 to trim out close to 0. But in open loop the fuel is uncontrolably rich. I'm convinced it has to be a leak, and I've found a few that I created looking for it, but not the magic one that makes the trims go negative. My tool truck guy even lent me a smoke machine to use but nothing...

What are the other ST folks using for injector scale?
Theoretically, I should be scaled closer to 3300...

How many people find themselves tuning the intake MAF table with a factory MAF housing to compensate for injectors?

When I said uncontrollably rich, one primary fuel map was tuned no richer than 13, and I was still seeing 10.2's. Running a normal 11 map will easily incurr 9's quickly after switching to ol. It sucks bad...

...and I go to sleep at night thinking, what haven't I checked or changed to find the leak...

But maybe there is no leak.
Are these problems the reason why modified injectors are free?

Help me out guys...

later, x
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Old 07-11-2006, 09:42 AM   #2
scoobdude
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post a log with these parameters:
a/f, tps, tps delta, stft, ltft, rpm

From there we can watch to see if its just a tip in issue or ncorrect scaling. Have you adjust the tip in at all? When you move to bigger injectors you will need to adjust tip in as well other wise you will get rich mixtures when you push on the throttle fast.
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Old 07-11-2006, 07:48 PM   #3
xFactor
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Here is a log screenshot;



Here is the fuel map that I am using to make the car run okay;



I've lowered the tip in map a bit, but it probably could use some more fine tuning.

How can I post a log other than a screenshot?

later, x
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Old 07-12-2006, 03:07 PM   #4
scoobdude
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Use the code option by the pictuer and hyperlink options. Insert the log data from the viewer in there (i used excel instead so it will copy over correctly.)
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Old 07-12-2006, 11:59 PM   #5
xFactor
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.....could you be a little more specific, like what format in excel to save as. Tab delimited, or space delimited, etc. What do you do with it then? Select and paste the whole thing, or paste it in the "Wrap code" box? I'm computer stoopid.....

I'm really certain that tip in isn't the huge problem.

I would really like to poll the community as to what their scaler vs. injector values are. If a few people say that they are trimming out their modded blues at 3200 and no one else is in the 4100's then I'll probably continue with my leak theory. If a few people have needed to tweak the intake table with a stock maf housing to get the fuel right, then I guess I'll have to get over that...

Callout to modded blue users; where are you scaled, how do you trim, do you hit your targets, and did you tweak the intake calibration?

sorry for all the questions

later, x

Last edited by xFactor; 07-13-2006 at 12:23 AM.
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Old 07-14-2006, 09:28 AM   #6
scoobdude
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just open the csv that ST saves teh log as. Then copy and paste the desired cells. I pasted the catagories on the first line only, hit enter and added the cells.You have a character limit though so watch out. then put it in the box that pops up after you click on the code button.

Also in your log above, try eliminating some of the data being logged so you can get a better resolution.
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Old 07-23-2006, 08:32 PM   #7
HighSpeedLowDrag
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I'm not familiar with wrx injectors, but I am running ST and had my stock STi injectors moddified by Perrin. I too had to use a much higher scale number than would be expected, and my OL logs were extremely rich like yours (9.X's). I ended up adjusting the latency values (which you normally shouldn't have to adjust if you are reusing stockers). This worked out well. After increasing my latency values, I was right about where I should have been with the scale value, and the car was running much closer to the primary fuel map. I am running full stock intake at this time, so I did not see a need to fool with the MAF settings.
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Old 07-23-2006, 08:49 PM   #8
Chp_Stix
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Posting Logs!

Copy and paste your log into MS Paint and then post it as a .jpeg regular picture
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